You can find all the genuine replacement parts you need at Escapa.
The Shimano SM-DUE11 magnetless speed sensor is a speed sensor unit for the SHIMANO STEPS e-bike platform
・Exclusive MTB design
»Rugged and durable platform for rough trails
»More space for wider tires
・Greater compatibility
»Compatible with the E8000, E7000, and E6100 series
»Compatible with 10/9/8-speed Center Lock FREEHUB disc brakes and 11-speed MTB Center Lock disc brakes, as well as 11/8-speed internal-gear hub Center Lock disc brakes
・Center Lock disc brake system
»Compact, uncluttered, low-profile design
»Easy rear wheel installation
・Combination of an E-BIKE-specific brake disc and magnet mount
»The magnet mount is NOT compatible with any other currently available rotors
»E-BIKE brake disc for the rear wheel ONLY
・Brake disc size
»RT-EM900: 160 mm, 180 mm, 203 mm
»RT-EM800: 160 mm, 180 mm
»RT-EM600: 160 mm, 180 mm, 203 mm
Included cable length: 760 mm
* MAGNET NOT INCLUDED
